小编use*_*929的帖子

所以我读了大约十几页解释如何做到这一点,而对于我的生活,我无法让它发挥作用.

我有一个用C++编写的库,以及一组用C编写的代码,用gnu​​编译器编译,我似乎无法从C调用C++代码.

我有一个用C++编写的库:

printHeadOO.hpp

#ifdef __cplusplus
extern "C" 
#endif

void printThis(void);

printSrcOO.cpp

#include "printHeadOO.hpp"
#include <iostream>

void printThis(void){
    std::cout<<"This is Printed Using C++ \n";
}

好吧,如果我从C++程序中调用它,它会编译,运行并且一切都很开心.但是假设我从C程序中调用它:

printMain.c

#include <stdio.h>
#include "printHeadOO.hpp" 

int main(void){
    printf("This is printed from C Main \n");
    printThis();

    return 0;   
}

所以一切都编译得很好:

#g++ -c printSrcOO.cpp
#gcc -c printMain.c

但是在链接时:

#gcc printSrcOO.o printMain.o -o myProgram

gcc抨击以下内容:

printSrcOO.o: In function `__static_initialization_and_destruction_0(int, int)':
printSrcOO.cpp:(.text+0x23): undefined reference to `std::ios_base::Init::Init()'
printSrcOO.o: In function `__tcf_0':
printSrcOO.cpp:(.text+0x6c): undefined reference to `std::ios_base::Init::~Init()'
printSrcOO.o: In function …